<template>
  <div>
    <h1>{{ title }}--count :{{ count }}</h1>
    <button @click="changeCount">改变值</button>
  </div>
</template>

<script>
export default {
  name: "One",
  data() {
    return {
      title: "One",
      count: 0,
    };
  },
  methods: {
    changeCount() {
      this.count++;
    },
  },
  mounted() {
    console.log("One");
  },
};
</script>

<style></style>
